Expansion joint



latented Feb. 2 1926.

PATENT OFFICE. f

ALBERT C. FISCHER, OF CHICAGO, ILLINOIS.

nxra'nsro'n JOINT.

No Drawing.

To all whom it may concern:

Be it known that I, ALBERT C. FISCHER, a citizen of the United States, residing in Chicago, county of Cook, State of Illinois,

5 have invented'a certain new and useful Improvement in Expansion Joints.

My invention relates to a mixture of hituminous matter containing corn cob fibres as distinguished from the old art in which hemp-flax-linters, oakum, felt, andeven sawdust were incorporated as is well known to those versed in the art.

I find the chafi'y, fibrous nature of the corn coh,"when ground, to be well suited for the purpose herein disclosed, namely, constructing expansion joints to take up expansion and contraction in concrete roads, buildings, etc. The ground corn cob is incorporated in the bituminous matter in about the same volumetric proportion as the above-mentioned fibrous matters have generally been employed, the asphalt being, of course,

warmed to a temperature which will permit it to be kneaded or stirred sufficiently to incorporate the ground corn cob therewith,

for instance, as described in my previously filed application of-May 10, 1922, Serial No. 559,908,v coveringthe lmprovements'in expansion joints, according to which.fibrous matter and other like substances, such as excelsior, are incorporated ina bituminous mixture while the bituminous material is merely plastic as distinguished from fluid Application filed September 11, 1922. Serial No. 587,611.

and therefore lacking in penetration power; or, if preferred, the mixing may be carried on in accordance with the common practice where fibrous matters, as hereinbefore pointed out, have previously been used in making expansion joints.

Sawdust is objectionable because of its 40 rosinous content, and fibrous mattersuch as hemp, flax, linters and feltings are exceedlngly expensive when compared to the cost of fibrous matter secured from the corn cob; likewise, the flat, chafiy fibre is quite strong and because of its flattened nature has greater binding power than the rounded lighter structures of fibre secured from linters, feltings, hemp, flax, etc.

The bituminous matter may be cellular or 60 solid, as desired.

.If the bituminous matter is to be developed in cellular structure or form, this can be accomplished by following the teachings of my Letters Patent No.1,401,974, granted J anuary-3, 1922, for sponge asphalt.

I claim:

1. Bituminous expansion joints having incorporated therein corn cob fibre.

'2. Cellular bituminous expansion joints having incorporated therein corn cob fibres. 3. Bituminous expansion joints having incorporated therein ground corn cob.

Signed at Chicago, Illinois, this 9th day of September, A. D. 1922.

ALBERT C. FISCHER. 

